InChI=1S/C21H26O9/c1-10-6-14(27-12(3)23)8-21(5)19(30-21)18-17(16(7-10)28-13(4)24)15(20(25)29-18)9-26-11(2)22/h6,14,16,18-19H,7-9H2,1-5H3